ntn ball screw support bearings 2 fretting resistance test rolling resistance against fretting while rolling is tested in the rotating and oscillating type fretting corrosion test a conceptual drawing of the test is shown in fig 13.5 and the test conditions are shown in table 13-4 in this test a housing plate is fixed and the shaft plate oscillates the decrease in the weight of the bearing plate after the test is shown in fig 13.6 due to the combination of a unique heat treatment and a special grease light-contact seal type the amount of wear is reduced to 1/10 or less compared to the conventional type consisting of standard suj2 steel rings and lithium based general purpose grease fig 13.6 3 rolling contact fatigue life test resistance to rolling contact fatigue is improved as a result of a special heat treatment leading to a longer service life compared to the standard heat-treated type model in both clean and contaminated oil fig 13.7 table 13.5 test conditions bearing mm radial l
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ntn ball screw support bearings 4 bearing designations the part number for a ballscrew bearing consists of a type code dimension code and various suffixes 2a-bst type 2a bst 20 47 1b dbt lxl p4 l588 grease code l588 urea based special grease tolerance class code p5 jis class 5 equivalent p4 jis class 4 equivalent up ntn class seal code lxl:light contact rubber seals arrangement code identification code outside diameter mm nominal bore diameter mm bearing type code heat treatment ht type axn and arn type 7 0 04 ht df gm p4 tolerance class code p5 jis class 5 p4 jis class 4 internal clearance code gm medium preload gh heavy preload arrangement code internal design code nominal bore diameter see dimension tables dimension series code bearing type code axn 2052 p4 tolerance class code p5 jis class 5 p4 jis class 4 dimension bore diameter outside diameter mm bearing type code axn arn 286
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ntn ball screw support bearings accuracy of ht type table 13.10 inner rings nominal bore diameter d single plane mean bore diameter deviation dmp class 5 high low 0 0 0 0 5 5 6 8 class 4 1 high low 0 0 0 0 4 4 5 6 class 2 1 high low 0 0 0 0 2.5 2.5 2.5 2.5 mean bore single radial plane bore inner ring diameter deviation diameter variation radial runout vdp vdmp kia diameter series 9 diameter series 0,2 class 5 class 4 class 2 class 5 class 4 class 2 class 5 class 4 class 2 class 5 class 4 class 2 max max max max 5 5 6 8 4 4 5 6 2.5 2.5 2.5 2.5 4 4 5 6 3 3 4 5 2.5 2.5 2.5 2.5 3 3 3 4 2 2 2.5 3 1.5 1.5 1.5 1.5 4 4 4 5 2.5 2.5 3 4 1.5 1.5 2.5 2.5 over 2.5 10 18 30 incl 10 18 30 50 1 the tolerance of bore diameter deviation ds applicable to classes 4 and 2 is the same as the tolerance of mean bore diameter deviation dmp this applies to the diameter series 0 or 2 for class 4 and all the diameter series for class 2 2 applicable to individual bearing rings manufactured for duplex bearings tab
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ntn ball screw support bearings accuracy of axn and arn type table 13.12 inner ring and outer ring nominal bearing bore dia d or nominal bearing outside dia d over incl mean bore dia 1 deviation thrust inner 1 ring bore dia deviation mean outside dia 2 deviation bearing height deviation unit outer ring radial1 outer2 outer ring 2 inner ring 1 width inner ring ring outside surface and deviation radial runout radial runout inclination outer ring 2 thrust dmp class 5 high low class 4 high low dis dmp class 5 high low class 4 high low ts cs kia class 5 class 4 kea max sd max thickness variation max high low high sia sea class 5 class 4 class 5 class 4 class 5 class 4 3 3 4 4 5 2 2 3 3 4 low high low max 18 30 50 80 120 30 50 80 120 150 0 0 0 6 8 9 0 0 0 5 6 7 61 75 90 40 50 60 0 0 0 9 10 11 0 0 0 7 8 9 0 370 0 130 4 5 5 3 4 4 8 10 11 5 6 7 8 9 10 4 5 5 1 applicable only to dimension d 2 applicable only to dimension d 6 basic preload and axial rigidity basic preloads for each type of ball s
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ntn ball screw support bearings 9 starting torque of 2a-bst type reference starting torque values for 2a-bst bearings are shown in tables 13.15 and 13.16 table 13.15 open type bst and 2a-bst starting torque reference n mm kgf cm df type db type bst17x47-1b 2a-bst17x47-1b bst20x47-1b 2a-bst20x47-1b bst25x62-1b 2a-bst25x62-1b bst30x62-1b 2a-bst30x62-1b bst35x72-1b 2a-bst35x72-1b bst40x72-1b 2a-bst40x72-1b bst40x90-1b 2a-bst40x90-1b bst45x75-1b 2a-bst45x75-1b bst45x100-1b 2a-bst45x100-1b bst50x100-1b 2a-bst50x100-1b bst55x100-1b 2a-bst55x100-1b 175 1.8 175 1.8 305 3.1 305 3.1 380 3.9 380 3.9 960 9.8 430 4.4 1165 11.9 1165 11.9 1165 11.9 dft type dtft type dftt type dbt type dtbt type dbtt type 245 2.5 245 2.5 420 4.3 420 4.3 510 5.2 510 5.2 1305 13.3 580 5.9 1580 16.1 1580 16.1 1580 16.1 355 3.6 355 3.6 615 6.3 615 6.3 755 7.7 755 7.7 1930 19.7 860 8.8 2340 23.9 2340 23.9 2340 23.9 275 2.8 275 2.8 470 4.8 470 4.8 590 6.0 590 6.0 1500 15.3 665 6.8 1815 18.5 1815 18.5 1815 18.5 bst17x47-1bl
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ball screw support bearings dimension tables angular contact thrust ball bearings for ball screws bst series contact angle d 17 60mm b r dynamic equivalent axial load pa number of rows in bearing arrangement number of rows subjected to axial load r1 r xfr 3 yfa 4 3 1 2 1.90 0.55 0.92 1 3 4 2 1 2 1 r 2.52 0.26 0.92 0.92 1 1 2 fa fr 2.17 fa fr 2.17 xyxy 1.43 1.90 0.76 0.55 0.92 0.92 0.92 1 1 1 1.17 2.32 0.88 0.35 0.92 0.92 0.92 1 1 1 d d1 d2 60° d d1 d2 static equivalent axial load poa fa 3.98fr open type part number boundary dimensions mm d d b rs min1 r1s min1 d d 17 20 25 30 35 40 40 45 45 50 55 55 60 47 47 62 62 72 72 90 75 100 100 100 120 120 b 15 15 15 15 15 15 20 15 20 20 20 20 20 rs min1 r1s min1 1 1 1 1 1 1 1 1 1 1 1 1 1 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 1 24.3 2 470 24.3 2 470 29.2 2 980 29.2 2 980 31.0 3 150 31.0 3 150 58.5 6 000 32.0 3 300 62.0 6 350 62.0 6 350 62.0 6 350 66.5 6 750 66.5 6 750 ca basic dynamic rated load ca kn kgf 2 39.5 4 000 39.5 4 000 4
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ball screw support bearings angular contact thrust ball bearings for ball screws 2a-bst series contact angle d 17 60mm b r dynamic equivalent axial load pa number of rows in bearing arrangement number of rows subjected to axial load r1 r xfr 3 yfa 4 3 1 2 1.90 0.55 0.92 1 3 4 2 1 2 1 r 2.52 0.26 0.92 0.92 1 1 2 fa fr 2.17 fa fr 2.17 xyxy 1.43 1.90 0.76 0.55 0.92 0.92 0.92 1 1 1 1.17 2.32 0.88 0.35 0.92 0.92 0.92 1 1 1 d d1 d2 60° d d1 d2 static equivalent axial load poa fa 3.98fr open type part number boundary dimensions mm d d b rs min1 r1s min1 d d 17 20 25 30 35 40 40 45 45 50 55 55 60 47 47 62 62 72 72 90 75 100 100 100 120 120 b 15 15 15 15 15 15 20 15 20 20 20 20 20 rs min1 r1s min1 1 1 1 1 1 1 1 1 1 1 1 1 1 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 1 24.3 2 470 24.3 2 470 29.2 2 980 29.2 2 980 31.0 3 150 31.0 3 150 58.5 6 000 32.0 3 300 62.0 6 350 62.0 6 350 62.0 6 350 66.5 6 750 66.5 6 750 ca basic dynamic rated load ca kn kgf 2 39.5 4 000 39.5 4 000 47.5 4 850 47.5
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ball screw support bearings duplex angular contact ball bearings ht series d 6 40mm bbbbd2 d1 d d d1 d2 d d back-to-back db example diagram 1 part number boundary dimensions mm back-to-back db 79m6adb 70m6db 79m8adb 70m8db 7000htdb 7001htdb 7002htdb 7203htdb 7004htdb 7204htdb 7205htdb 7206htdb 7208htdb face-to-face df 79m6adf 70m6df 79m8adf 70m8df 7000htdf 7001htdf 7002htdf 7203htdf 7004htdf 7204htdf 7205htdf 7206htdf 7208htdf d 6 6 8 8 10 12 15 17 20 20 25 30 40 d 15 17 19 22 26 28 32 40 42 47 52 62 80 2b 10 12 12 14 16 16 18 24 24 28 30 32 36 rs min1 r1s min1 0.2 0.3 0.3 0.3 0.3 0.3 0.3 0.6 0.6 1.0 1.0 1.0 1.1 0.1 0.15 0.15 0.15 0.15 0.15 0.15 0.3 0.3 0.6 0.6 0.6 0.6 dynamic kn ca 2.05 2.67 2.93 4.40 6.10 6.65 7.60 13.8 12.8 17.9 20.2 28.1 44.0 face-to-face df basic load ratings static dynamic static kgf coa 2.09 2.41 3.25 4.40 6.30 7.45 9.50 16.4 17.0 23.1 28.8 41.5 71.0 ca 209 273 298 450 620 680 775 1 400 1 300 1 830 2 060 2 860 4 500 coa 213 246 335 445 640 760 970 1 670 1 730 2
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ball screw support bearings needle roller bearings with double-direction thrust needle roller bearings axn series d 20 50mm t c r1 dw r d d dw f d1 part number d dw boundary dimensions mm t 0 0.370 d d1 0.20 0.50 c 0 0.130 f dw rs min1 r1s min1 dynamic static radial kn cr cor 15.1 22.1 24.8 26.4 28.0 38.5 41.0 22.4 34.0 41.5 47.0 52.5 74.5 82.0 basic load ratings dynamic static dynamic static radial axial kgf kn cr cor ca coa 1 540 2 260 2 520 2 700 2 860 3 950 4 150 2 280 3 500 4 250 4 800 5 400 7 550 8 400 14.6 16.3 17.8 27.4 29.8 31.5 38.0 58.0 69.5 81.5 110 128 143 186 axn2052 axn2557 axn3062 axn3570 axn4075 axn4580 axn5090 20 25 30 35 40 45 50 20 25 30 35 40 45 50 0.061 0.040 0.061 0.040 0.061 0.040 0.075 0.050 0.075 0.050 0.075 0.050 0.075 0.050 52 57 62 70 75 80 90 42 47 52 60 65 70 78 40 44 44 48 48 54 54 16 20 20 20 20 25 25 25 30 35 40 45 50 55 2 2 2 3 3 3 3 0.6 0.6 0.6 1 1 1 1 0.6 0.6 0.6 0.6 0.6 0.6 0.6 1 minimum allowable value for corner radius dimension r or r1 2 startin
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ball screw support bearings needle roller bearings with double-direction thrust cylindrical roller bearings arn series d 20 70mm t c r1 r dw d d dw f d1 part number d dw boundary dimensions mm t 0 0.370 d d1 0.20 0.50 c 0 0.130 f dw rs min1 r1s min1 dynamic static radial kn cr cor 15.1 22.1 22.1 24.8 24.8 26.4 26.4 28.0 28.0 38.5 38.5 41.0 41.0 41.0 44.5 45.0 55.0 57.0 22.4 34.0 34.0 41.5 41.5 47.0 47.0 52.5 52.5 74.5 74.5 82.0 82.0 85.0 98.0 91.5 104 119 basic load ratings dynamic static dynamic static radial axial kgf kn cr cor ca coa 1 540 2 260 2 260 2 520 2 520 2 700 2 700 2 860 2 860 3 950 3 950 4 150 4 150 4 200 4 550 4 600 5 600 5 800 2 280 3 500 3 500 4 250 4 250 4 800 4 800 5 400 5 400 7 550 7 550 8 400 8 400 8 700 10 000 9 350 10 600 12 200 27.3 53.5 27.8 54.5 31.0 74.5 43.0 82.0 45.5 85.0 48.0 121 62.5 125 130 134 138 142 68.0 129 72.5 139 87.0 190 121 222 135 238 150 340 215 365 385 410 435 460 arn2052t2 arn2062 arn2557t2 arn2572 arn3062t2 arn3080 arn3570t2 arn3585 arn4075
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ball screw support bearings r1a ra da da basic load ratings dynamic static axial kgf ca coa 2 780 5 450 2 840 5 550 3 150 7 600 4 350 8 350 4 650 8 650 4 900 12 300 6 350 12 800 13 200 13 700 14 100 14 500 6 900 13 100 7 400 14 200 8 900 19 400 12 400 22 600 13 800 24 200 15 300 34 500 21 900 37 000 39 500 42 000 44 500 47 000 limiting speeds min-1 grease oil lubrication lubrication 1 800 1 500 1 500 1 200 1 400 1 100 1 200 1 000 1 100 950 1 000 850 900 800 750 700 650 650 7 000 6 000 6 000 4 900 5 500 4 400 4 800 4 100 4 400 3 800 4 000 3 300 3 600 3 100 2 900 2 700 2 600 2 500 radial clearance m da min max min abutment and fillet dimensions mm da ras r1as max max max preload starting 2 torque n n mm approx mass kg approx part number 10 10 10 10 10 10 10 10 10 10 10 15 15 15 15 15 15 15 30 30 30 40 40 40 40 40 40 40 40 50 50 50 50 50 50 50 39 48 44 56 49 63 56 68 61 73 66 83 75 88 93 98 103 106 46 56 51 66 56 73 64 77 69 87 74 96 83 101 106 111 116 121 0.6 1 0.6 1 0.6 1 1 1 1 1 1 1
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